Washer



April 30, 1940. H. w. WISHART WASHER Filed Oct. 6, 1938 pg. 1C2

' TOR.

INVE MOLD! 74 !)H4RZ' BY a Patented Apr. 30, 1940 PTA-TENT OFFICE WASHER Harold W. Wishart, Saginaw, Mich., assignor to Fredericksen Company, Saginaw, Mich., a corporation of Michigan Application October 6, 1938, SerialNo. 233,592

'1 Claim. [(0]. 85-51) My inventionrelates tov improvements in washers'of the type comprising a plurality of complementary sections adapted to be assembled as an annular ring around a rod or shaft and disassembled quickly and easily, either section being replaceable by a new section when desired.

It relates more particularly to a novel and simplified means for securing together the complementary sections so that they will remain in alignment with each other with their respective flat faces lying in the same plane.

An object is to provide as an integral part of each such washer section a fastening and aligning device which shall be constructed so as to be easily and accurately machined by simple and inexpensive operations and equipment, and providing a strong rigid washer at small cost.

Fig. 1 is a plan. view of the washer assembled,

the view being partly in section and partly broken away, with the shear pin removed.

Fig. la. is a view of one of the concealed shear pins.

Fig. 2 is a fragmentaryend view of one of the sections, seen in the direction of the arrows,

Fig. 1.

A washer embodying my invention in a preferred form comprises a plurality of complementary similar sections I, each of which has concentric inner and outer walls 2, 3, and parallel flat side walls.

. When fastened together in the manner which will be described, the sections I, l comprise an annular ring having a smooth bore on the inside, a smooth outer rim, and smooth fiat sides. As shown in the drawing, the annular ring is made up of two sections, I, I, but a greater number of complementary sections may be employed if desired. The interlocking mechanism by which the sections are fitted together and fastened consists of the following devices:

Each curved member I has faces 4, 5130 present confronting faces on the two parts when assembled. In the drawing a clearance isshown at 6 betweenthe two confronting faces merely for'purposes of illustration. It will be understood that in practice the faces are in close abutting relation with each other. One end face 4 has projecting from it a dowel 1, preferably circular. Usually section I is a casting made of a suitablebearing metal alloy and the dowel I is integral with it. The other end 5 of the section I is formed with a bore hole 8 to receive the complementary dowel 1 of the other section, the dowel being machined to closely fit the bore, as is shown at the top of Fig. 1. A groove 9 extends around the base of the dowel 6, to provide a fillet that prevents fracture of the dowel at its base and also to provide a clearance that enables the two end faces 4, 5 to come into intimate contact with each other.

Each pin 1 is formedwith a transverse hole I0, and in alignment with this hole the complementary section of ring I is bored with a similar hole ll that extends from the outer periphery of the ring through the bore hole 8 and preferably terminates before reaching the inner bore of the ring section. The hole II in section I may terminate in a transverse groove l2 formed in the outer Wall 3.

In assembling the sections a shear pin l3, shown in Fig. 1a, is inserted with a moderate push fit into the alined hole II and through the hole H] of dowel l. The upper end of the shear pin l3 projects into the groove l2, as indicated by dottedlines, Fig. 1, but not beyond the outer face 3 of the washer. The outer end l4 of the shear pin l3 may be swaged slightly, as by a center punch, to keep the pin in place and yet permit itsremoval.

The shear pin hole II is so accurately in register with the hole In that the shear pin l3 can be passed through without deforming the pieces by burrs. Also, the closeness of the fit between the dowel I and the hole 8 in section I enables the pin l3 to be made of very small diameter, say, one-sixteenth inch or less, and still be effective to hold the ring sections together under all conditions of use of the washer, since the only stresses on the pin and also on the dowel are simple direct shears and not bending strains, as might be the case if the dowel l and the member l did'no'tfit each other accurately. The shape and arrangement of the dowel enable this to be done at very small cost.

Heretofore, in structures of this kind the interlooking members were usually wedge shaped or vice because the dowel I can be formed accurately by a simple turning tool without the aid of expensive machinery, and the hole 8 can be easily bored so exactly that an extremely close fit can be obtained, giving adequate rigidity to the assembled Washer in all directions. This locking device considered as an article of manufacture is very simple and cheap. It is easily assembled by a straight inward movement, afterward pushing in the shear pin i3. it; that projects into the recess l2 can be seized by pliers and pulled out whenever it is desired The uppervend of pin r bearing. That difficulty is obviated in my dejected to bending action, which would otherwise be present if the shape and size of the pin and its fit in the bore of the opposite piece were to permit any appreciable amount of play between the parts.

The fillet groove 9 may in some cases be dispensed with if desired, and a fillet of usual shape without a groove may be employed.

Having thus described my invention, what I claim and desire to secure by Letter Patent is:

A metal washer comprising two similar flat semi-circular sections each having two flat end faces, one face of each section being provided with a bore, the other face of each section being provided with a projecting dowel tangential to the circle of the Washer and received within and fitting closely the bore of the other section when said sections are in assembled relation; there being a transverse hole through each of said sections intersecting the bore therein and a transverse hole througheach'dowel, said holes being in'alinementwhen the saidfaces are in abutting relation, and a pin received in and extending through said alined holes.

HAROLD W. WISHART. 

